Remove the syringe from the bottle. Click here for an email preview. If it is not treated right away, priapism can permanently damage your penis sudden vision loss in one or both eyes. The Nov. If you see air bubbles in the syringe, repeat the steps. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Tell your doctor if any of these symptoms are severe or do not go away: headache.Sildenafil (Viagra) is used to treat erectile dysfunction (impotence; inability to get or keep an erection) in men. Sildenafil (Liqrev, Revatio) is used to improve the ability to exercise in adults (Liqrev, Revatio) and children 1 year of age and older (Revatio) with pulmonary arterial hypertension (PAH; high blood pressure in the vessels carrying blood to the . For a package of four Viagra pills, with each pill at milligrams, the new price is about $37, she said. The price had been about $ The new prices are now in effect, she added. Side Effects. Dizziness, headache, flushing, or stomach upset may occur. Vision changes such as increased sensitivity to light, blurred vision, or trouble telling blue and green colors apart may.

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